Optical orthogonal frequency division multiplexed communications with nonlinearity compensation

a technology of orthogonal frequency division and multiplexing, applied in multiplex communication, polarisation multiplex system, phase-modulated carrier system, etc., can solve the problems of impracticality, long system latency, and inability to ensure the control of relative optical phase shifts. achieve the effect of improving performance and high throughpu

Inactive Publication Date: 2009-07-30
CELIGHT
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Benefits of technology

[0010]The present invention provides a system and method for optical communications with a high throughput. The system and method are disclosed for optical transmission with M-PSK modulating of an optical sig...

Problems solved by technology

However it is completely impractical to assure perfect control of the relative optical phase shifts between different WDM channels as they travel through their respective fibers (shown as 10a in FIG. 2 of '236) and through the MUX.
The latency of the system is quite long, it includes travel time through the link, plus processing, which is typically a few milliseconds.
The calculations show that the size of...

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  • Optical orthogonal frequency division multiplexed communications with nonlinearity compensation
  • Optical orthogonal frequency division multiplexed communications with nonlinearity compensation
  • Optical orthogonal frequency division multiplexed communications with nonlinearity compensation

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Embodiment Construction

[0024]This disclosure describes a number of embodiments of one or more optical transmission systems and elements. Within this disclosure, the term “optical” indicates electromagnetic range at or near optical frequencies; this includes visible light and so-called “near-visible” light such as near infrared, infrared, far infrared and the near and far ultra-violet spectra. The preferred operating range is around 1.5 micron.

[0025]FIG. 1 illustrates a point-to-point OFDM data transmission system using coherent detection. In a transmitter I a digital data stream 2 enters an OFDM encoder 3, which outputs two analog signals 4 and 5 (I and Q) driving an optical modulator 6. The modulator 6 applies the modulation to a light beam 7 emitted by a light source 8. The signal 9 transmitted via an optical link 10 is received by coherent receivers 11. Local oscillator optical signal 12 coming from a light source 13 enters the coherent receiver 11 and interferes with the optical signal 14. The receive...

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Abstract

The present invention discloses a transmitter and receiver for optical communications system, which provide compensation of the optical link nonlinearity. M-PSK modulating is used for data embedding in an optical signal in each WDM channel using orthogonal frequency division multiplexing (OFDM) technique. At the receiver side electrical output signals from a coherent optical receiver are processed digitally with the link nonlinearity compensation. It is followed by the signal conversion into frequency domain and information recovery from each subcarrier of the OFDM signal. At the transmitter side an OFDM encoder provides a correction of I and Q components of a M-PSK modulator driving signal to compensate the link nonlinearity prior to sending the optical signal to the receiver.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. provisional application 61 / 045,783 filed Apr. 17, 2008, and this application is a continuation-in-part of U.S. patent application Ser. No. 12 / 045,765 filed Mar. 11, 2008, Ser. No. 11 / 679,376 filed Feb. 27, 2007 and Ser. No. 11 / 695,920 filed Apr. 3, 2007, all of which applications are fully incorporated herein by reference.FIELD OF INVENTION[0002]This invention relates generally to optical communications systems and methods that utilize coherent detection technique, WDM M-PSK transmission and optical orthogonal frequency division multiplexing (OFDM). In particular the present invention addresses a method and system for digital compensation of nonlinearity in optical signals received via optical communication link. The invention discloses communication typically up to 100 Gb / s transmission rate that can be implemented for various information exchange structures including data transmission and video b...

Claims

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Application Information

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IPC IPC(8): H04J14/02
CPCH04B10/61H04B10/611H04B10/613H04B10/614H04B10/6163H04B10/6165H04L2027/0018H04J14/02H04J14/06H04L27/18H04L27/2096H04L27/2697H04B10/63H04B10/65
Inventor KHURGIN, JACOBSHPANTZER, ISAAC
Owner CELIGHT
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